Changes in phytohormones and oxidative stress markers in buried seeds of Vellozia alata

Munné‐Bosch, Sergi; Oñate, Marta; Oliveira, Patrícia Gonçalves de; Garcia, Queila Souza

doi:10.1016/j.flora.2010.11.012

Cited by 17 publications

(12 citation statements)

References 36 publications

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“…The requirement of light for germination has been reported for other species of Velloziaceae (Garcia & Diniz 2003;Garcia et al 2007;Munné-Bosch et al 2011;Soares-da-Mota & Garcia 2013;Vieira et al 2017a), and was confirmed here. Based on length and mass, the seeds studied here are considered small relative to other known species.…”

Section: Discussionsupporting

confidence: 89%

“…Seeds that remain could still be recruited in the next rainy season, when the minimal environmental conditions (at least water and adequate temperature) for germination coexist. Furthermore, species of Velloziaceae have been reported to build persistent soil seed banks (Munné-Bosch et al 2011;Garcia et al 2017) without, however, performing dormancy cycles (Garcia et al 2017), reinforcing the hypothesis of recruitment over time. Interestingly, seeds of some species, especially B. markgrafii, B. flava and V. compacta, germinated in the dark (Fig.…”

Section: Discussionmentioning

confidence: 68%

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Temperature and light requirements for germination of species of Velloziaceae from different Brazilian rocky outcrops

Bicalho

Soares-da-Mota²,

Garcia

2018

Acta Bot. Bras.

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Germination is the fi rst step to successful plant establishment. Th e range of factors that promote germination varies among species. Light and temperature requirements for the germination of species of Velloziaceae were investigated. Seeds of Barbacenia fl ava, B. markgrafi i, B. purpurea, B. williamsi, Vellozia alata, V. compacta, V. glochidea and V. plicata were collected from rocky outcrops located in diff erent Brazilian states and were incubated for germination at 10 to 40 °C in light or dark conditions. Seed mass and length were measured for each species. In general, all species exhibited a high germination percentage at temperatures of 15-40 °C in the light, with the optimal temperature being 25-30 °C for species of Barbacenia and 30 °C for species of Vellozia. Barbacenia fl ava, V. compacta and, particularly, B. markgrafi i, germinated in the dark. In contrast, B. purpurea exhibited an absolute requirement for light and the most restricted range of temperature to germinate. Germination responses and seed traits were related to the microclimate where the species were collected, and germinability in darkness is likely a common trait for species of Velloziaceae from the Espinhaço Range.Keywords: Barbacenia, darkness, granitic outcrops, inselbergs, ironstone outcrops, optimal temperature, quarzitic outcrops, Vellozia Acta Botanica Brasilica -32(2): 240-246. April-June 2018.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 68%

Temperature and light requirements for germination of species of Velloziaceae from different Brazilian rocky outcrops

Bicalho

Soares-da-Mota²,

Garcia

2018

Acta Bot. Bras.

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“…Viability losses during storage result from accumulations of ROS and its associated damage and a decrease in antioxidant mechanisms, which lead to oxidative damage during seed imbibition ). Losses of ROS-scavenging enzyme activities, the occurrence of oxidative reactions leading to membrane damage and lipid peroxidation have been reported with progressive seed aging (Bailly et al 1996;Munné-Bosch et al 2011;Pukacka & Ratajczak 2007). However, viability losses are not always associated with lipid peroxidation and may be due to oxidative damage to proteins and nucleic acids .…”

Section: Ros the Environment And Seed Germinationmentioning

confidence: 99%

Reactive oxygen species and seed germination

2013

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Reactive oxygen species (ROS) are continuously produced by the metabolically active cells of seeds, and apparently play important roles in biological processes such as germination and dormancy. Germination and ROS accumulation appear to be linked, and seed germination success may be closely associated with internal ROS contents and the activities of ROS-scavenging systems. Although ROS were long considered hazardous molecules, their functions as cell signaling compounds are now well established and widely studied in plants. In seeds, ROS have important roles in endosperm weakening, the mobilization of seed reserves, protection against pathogens, and programmed cell death. ROS may also function as messengers or transmitters of environmental cues during seed germination. Little is currently known, however, about ROS biochemistry or their functions or the signaling pathways during these processes, which are to be considered in the present review.

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“…However, the buried seeds are not an assurance of plant recruitment, at least for Vellozia alata L.B. Sm., because the potential for germination of its seeds decreases in few months (Munné-Bosch et al 2011). Velloziaceae is an important family for conservation biology (Munné-Bosch et al 2011), with 211 species from Brazil, of which 208 are endemic to this country (Mello-Silva 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Sm., because the potential for germination of its seeds decreases in few months (Munné-Bosch et al 2011). Velloziaceae is an important family for conservation biology (Munné-Bosch et al 2011), with 211 species from Brazil, of which 208 are endemic to this country (Mello-Silva 2010). Vellozia sincorana is a threatened species, is endemic to campos rupestres in Bahia, and its populations are under pressure from human activities (Funch et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Post-fire flowering and fruiting in Vellozia sincorana, a caulescent rosette plant endemic to Northeast Brazil

Conceição

Orr

2012

Acta Bot. Bras.

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A quantidade de fl ores e/ou frutos foi positivamente e signifi cativamente correlacionada com a altura das plantas. A abundante fl oração depois do incêndio é um indicativo do fogo como fator que dispara essa fase fenológica. Estimativa da idade de indivíduos altos e eventos de fl oração podem ser utilizados para estimar a frequência do fogo em áreas de populações de V. sincorana, contribuindo para o conhecimento da ecologia do fogo e para conservação biológica e manejo do fogo nos campos rupestres. 28'W) on ridgetops in the Chapada Diamantina National Park (Brazil) were monitored, one burned in the November 2008 fi re and the other unburned since the 1999 fi re. In both sites, 25 individuals were randomly labeled and monitored. Nine plant samplings were conducted between 2008 and 2010, during which the number of fl owers and fruits were tallied and the heights measured. Spearman's rank correlation coeffi cient and linear regression were used to evaluate the relationship between the height of individuals and phenology. Flowering and fruiting occurred only in the recently burnt population, about 40 days aft er the fi re, in 24 of the 25 individuals monitored (96%). Th e quantity of fl ower and/or fruit was positively and signifi cantly correlated with plant height. Th e abundant fl owering aft er fi re suggests that fi re triggers this phenological phase. Estimates of age of the taller individuals and the periods of fl owering can be used to estimate fi re frequency in the V. sincorana population sites, which contributes to the knowledge of fi re ecology and is useful for conservation biology and fi re management of campos rupestres.

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Changes in phytohormones and oxidative stress markers in buried seeds of Vellozia alata

Cited by 17 publications

References 36 publications

Temperature and light requirements for germination of species of Velloziaceae from different Brazilian rocky outcrops

Temperature and light requirements for germination of species of Velloziaceae from different Brazilian rocky outcrops

Reactive oxygen species and seed germination

Post-fire flowering and fruiting in Vellozia sincorana, a caulescent rosette plant endemic to Northeast Brazil

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